International Date Line
E69390
The International Date Line is an imaginary longitudinal line, roughly following the 180th meridian through the Pacific Ocean, where calendar dates change by one day when crossed.
All labels observed (2)
| Label | Occurrences |
|---|---|
| International Date Line canonical | 16 |
| International Dateline | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T553925 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: International Date Line Context triple: [Bering Strait, crossedBy, International Date Line]
-
A.
Humboldt meridian
The Humboldt meridian is a principal survey meridian used as a reference line for land surveying and mapping in parts of northern California.
-
B.
Prime Meridian
The Prime Meridian is the internationally recognized zero-degree line of longitude from which all other longitudes and global time zones are measured.
-
C.
San Bernardino meridian
The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
-
D.
Equator
The Equator is an imaginary line encircling the Earth at equal distance from the poles, dividing the planet into Northern and Southern Hemispheres and marking 0° latitude.
-
E.
Tropic of Capricorn
The Tropic of Capricorn is the southernmost latitude where the sun can appear directly overhead, marking an important boundary of the Earth's tropical zone.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: International Date Line Target entity description: The International Date Line is an imaginary longitudinal line, roughly following the 180th meridian through the Pacific Ocean, where calendar dates change by one day when crossed.
-
A.
Humboldt meridian
The Humboldt meridian is a principal survey meridian used as a reference line for land surveying and mapping in parts of northern California.
-
B.
Prime Meridian
The Prime Meridian is the internationally recognized zero-degree line of longitude from which all other longitudes and global time zones are measured.
-
C.
San Bernardino meridian
The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
-
D.
Equator
The Equator is an imaginary line encircling the Earth at equal distance from the poles, dividing the planet into Northern and Southern Hemispheres and marking 0° latitude.
-
E.
Tropic of Capricorn
The Tropic of Capricorn is the southernmost latitude where the sun can appear directly overhead, marking an important boundary of the Earth's tropical zone.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
geographical concept
ⓘ
imaginary line ⓘ line of longitude ⓘ |
| approximateLongitude | 180 degrees ⓘ |
| bendsAround |
Aleutian Islands
ⓘ
Fiji ⓘ Kiribati ⓘ New Zealand’s territories ⓘ |
| category |
geodesy
ⓘ
geography ⓘ timekeeping ⓘ |
| crosses |
Bering Sea
ⓘ
Pacific Ocean ⓘ Southern Ocean ⓘ |
| deviatesToAvoid |
landmasses
ⓘ
political borders ⓘ |
| deviatesToRespect | national timekeeping preferences ⓘ |
| followsApproximately | 180th meridian ⓘ |
| governs | direction-dependent date change ⓘ |
| hasEffect |
aligns civil dates with Earth’s rotation
ⓘ
date changes by one day when crossed ⓘ maintains global timekeeping consistency ⓘ |
| hasFunction |
calendar date change boundary
ⓘ
date demarcation ⓘ |
| hasNoSingleTreaty | true ⓘ |
| isArbitraryConvention | true ⓘ |
| isImaginary | true ⓘ |
| isLegalBoundary | false ⓘ |
| isOpposite | Prime Meridian ⓘ |
| isPoliticalBoundary | false ⓘ |
| isShownOn |
aviation charts
ⓘ
nautical charts ⓘ world maps ⓘ |
| isStandardizedBy | international convention ⓘ |
| locatedIn |
Earth
ⓘ
Pacific Ocean ⓘ |
| referenceSystem |
Coordinated Universal Time
ⓘ
time zones ⓘ |
| relatedTo |
Coordinated Universal Time
ⓘ
Greenwich Mean Time ⓘ Prime Meridian ⓘ time zone boundaries ⓘ |
| ruleWhenCrossingEastward | date goes back by one day ⓘ |
| ruleWhenCrossingWestward | date advances by one day ⓘ |
| separates |
consecutive calendar dates
ⓘ
today and tomorrow ⓘ yesterday and today ⓘ |
| usedBy |
airlines
ⓘ
international travelers ⓘ navigators ⓘ shipping companies ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: International Date Line Description of subject: The International Date Line is an imaginary longitudinal line, roughly following the 180th meridian through the Pacific Ocean, where calendar dates change by one day when crossed.
Referenced by (17)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: International Date Line